Add leafnode for unix systems

pkgs/servers/news/leafnode/default.nix

@@ -0,0 +1,28 @@
+{ stdenv, fetchurl, pcre }:
+
+stdenv.mkDerivation rec {
+  name = "leafnode-2.0.0.alpha20121101a.12";
+
+  src = fetchurl {
+    url = "http://home.pages.de/~mandree/leafnode/beta/leafnode-2.0.0.alpha20121101a.tar.bz2";
+    sha256 = "096w4gxj08m3vwmyv4sxpmbl8dn6mzqfmrhc32jgyca6qzlrdin8";
+  };
+
+  configureFlags = "--enable-runas-user=nobody";
+
+  postConfigure = ''
+      # The is_validfqdn is far too restrictive, and only allows
+      # Internet-facing servers to run.  In order to run leafnode via
+      # localhost only, we need to disable this check.
+      sed -i validatefqdn.c -e 's/int is_validfqdn(const char \*f) {/int is_validfqdn(const char *f) { return 1;/;'
+  '';
+
+  buildInputs = [ pcre];
+
+  meta = {
+    homepage = "http://leafnode.sourceforge.net/";
+    description = "Leafnode implements a store & forward NNTP proxy";
+    license = "X11";
+    platforms = stdenv.lib.platforms.unix;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -6443,6 +6443,8 @@ let
 
   joseki = callPackage ../servers/http/joseki {};
 
+  leafnode = callPackage ../servers/news/leafnode { };
+
   lighttpd = callPackage ../servers/http/lighttpd { };
 
   mailman = callPackage ../servers/mail/mailman { };